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Showing results for: [ Zhang, Songbo ]
The Parkes Pulsar Timing Array (PPTA) project has three primary goals: (a) detection of gravitational waves from astronomical sources, (b) establishment of a pulsar timescale, and (c) improvement of o... moreur understanding of Solar-system dynamics. The PPTA is the oldest of three international pulsar timing groups. We have the smallest telescope and the smallest group, but the best measurements and the best results. Our bound on the strength of the incoherent gravitational wave background is the only bound which significantly constrains theoretical models. We have maintained our leading position because: we have the southern sky; we have a small but well-focussed group; we have the best-calibrated receivers; and we have been able to observe with an almost regular cadence of 15 to 20 days over a wide bandwidth. With this proposal we aim to maintain our pre-eminent position in the field. Unlike most observing proposals, this is a continuing proposal for which the observations will continue to improve bounds on ultra-low-frequency gravitational waves until they are finally detected. Continued Parkes observations will remain valuable at least until the first stage of the SKA is able to improve on our sensitivity and observing cadence. Even after the gravitational wave background is detected we will want to continue observations in support of the nascent field of gravitational wave astronomy!less
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 17 Feb 2020
This database records all the single pulse candidates with snr above 7 during re-processing all of the observations obtained during the first four years (from 1997 to 2001) of the Parkes multibeam rec... moreeiver. It contains 568,736,756 pulse candidates, include five FRBs (one is new); five single pulse candidates from unknown sources, but with Galactic dispersion measure, and 385 unique pulsars with single pulses of S/N >=8. We also provide few tools to manage the database : https://bitbucket.csiro.au/scm/spdb/spc-usertools.gitless
ATNF Science – Astronomy Research - - Published 31 Jan 2020
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 29 Dec 2019
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 17 Nov 2019
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 13 Nov 2019
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 07 Nov 2019
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 31 Oct 2019
This collection contains data from the Parkes Pulsar Timing Array (PPTA) project. This project makes use of observations of radio pulsars from the CSIRO Parkes radio telescope. The project has three m... moreain goals: 1) detecting gravitational waves, 2) developing a pulsar-based time standard and 3) searching for unknown objects in our solar system. The data provided here is the second data release from the PPTA project. It contains pulse arrival times and timing models for 26 millisecond pulsars.less
ATNF Science – Astronomy Research - - Published 31 Oct 2019
Australia Telescope National Facility - P456 - A millisecond pulsar timing array - Published 29 Oct 2019
Finding radio pulsars orbiting near Sgr A* is a major goal of pulsar surveys with existing telescopes and future telescopes such as the Square Kilometer Array (SKA). The discovery of such pulsars will... more allow us to measure relativistic effects through timing of pulsars in tight orbits around Sgr A*, to characterise the distribution of dark matter near Sgr A*, to study the stellar population in the GC region and to probe the scattering region around Sgr A*. Although several surveys of the GC region have done, the Ultra-Wideband Low (UWL) receiver provides us a much wider frequency coverage with great sensitivity and therefore it is an excellent chance to revisit the GC region. At around 4GHz, a survey with UWL will achieve a sensitivity significantly higher than previous Parkes and Green Bank surveys, especially for pulsars with short spin periods and high dispersion measures.less
Australia Telescope National Facility - P991 - A Pulsar Survey Towards the Galactic Centre With the Ultra-Wideband Low Receiver - Published 16 Oct 2019
This collection is used to store data files from the Ultra-Wideband Low (UWL) receiver system of the Parkes for three pulsars (C, D and J) in 47 Tucanae (47Tuc or NGC 104) globular cluster. This data... more collection contains (1) the raw files of multiple, fold-mode observations (with the file extension .rf), (2) the calibration files (with the file extension .cf), (3) the calibrated and RFI-removed profiles (with the file extension .calib_zap) and (4) the flux and polarisation calibrated files (with the file extension .fluxcal and .pcm) for these three pulsars.less
ATNF Science – Astronomy Research - - Published 27 Sep 2019
This collection contains observational data of the fast radio bursts FRB 171209, FRB 180309, FRB 180311 and FRB 180714, detected during Parkes Pulsar Timing Array (P456) observations using the 21cm Mu... morelti-beam receiver on the Parkes 64m radio telescope.less
ARC Future Fellowship - George Hobbs - Fast Radio Bursts - Published 01 Jul 2019
Australia Telescope National Facility - P991 - A Pulsar Survey Towards the Galactic Centre With the Ultra-Wideband Low Receiver - Published 20 Jun 2019
Australia Telescope National Facility - P991 - A Pulsar Survey Towards the Galactic Centre With the Ultra-Wideband Low Receiver - Published 13 Jun 2019
Australia Telescope National Facility - P991 - A Pulsar Survey Towards the Galactic Centre With the Ultra-Wideband Low Receiver - Published 05 Jun 2019
Australia Telescope National Facility - P991 - A Pulsar Survey Towards the Galactic Centre With the Ultra-Wideband Low Receiver - Published 30 Apr 2019
Australia Telescope National Facility - P991 - A Pulsar Survey Towards the Galactic Centre With the Ultra-Wideband Low Receiver - Published 29 Apr 2019
Australia Telescope National Facility - P991 - A Pulsar Survey Towards the Galactic Centre With the Ultra-Wideband Low Receiver - Published 21 Apr 2019
Finding the pulsar born in SN 1987A would be of major significance. It would be by far the youngest pulsar known and would enable unique investigations of the early evolution and birth properties of a... more pulsar, as well as acting as a probe of the circumstellar and interstellar medium. We propose to use the new Ultra-Wideband Low (UWL) receiver to attempt confirmation of dispersed pulse candidates from previous P834 observations, to search for more isolated (giant) pulses and to continue the search for periodic emission from a pulsar associated with SN 1987A. The UWL receiver, with its much wider bandwidth and much lower system noise compared to the 10cm/50cm system will allow searches with much higher sensitivity.less
Australia Telescope National Facility - P834 - Searching for the pulsar in SN1987A - Published 18 Apr 2019
Australia Telescope National Facility - P834 - Searching for the pulsar in SN1987A - Published 17 Apr 2019
Australia Telescope National Facility - P834 - Searching for the pulsar in SN1987A - Published 15 Apr 2019
